I was absolutely floored to stumble across an audio from 1903. The 1903 audio is part of the speech from 1895: http://historymatters.gmu.edu/d/88.
I haven’t read the full speech, but what caught my eye was the second from last paragraph of the full speech, in part:
the agitation of questions of social equality is the extremest folly, and that progress in the enjoyment of all the privileges that will come to us must be the result of severe and constant struggle rather than of artificial forcing. No race that has anything to contribute to the markets of the world is long in any degree ostracized. It is important and right that all privileges of the law be ours, but it is vastly more important that we be prepared for the exercise of these privileges.
The full speech from 1895: http://historymatters.gmu.edu/d/39 Booker Washington